Scoundrel's regret, letting own goal in (5)
I believe the answer is:
rogue
'scoundrel's' is the definition.
(rogue is a kind of scoundrel)
'regret letting own goal in' is the wordplay.
I cannot really understand how this works, but
'own goal' could be 'og' (football abbreviation) and 'og' is present in the answer.
'regret' could be 'rue' (to rue something is to regret it) and 'rue' is located in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for rogue that I've seen before include "Baddy" , "Diverging from type" , "Chap in gallery" , "Profligate" , "Diseased plant" .)